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Table 3 Groups of S. suis strains with different combinations of tetracycline genes and respective minimal inhibitory concentrations.

From: The antimicrobial resistance patterns and associated determinants in Streptococcus suisisolated from humans in southern Vietnam, 1997-2008

Number of isolates

Group

Tetracycline resistance genes

MIC50* (mg/L)

Range of MIC (mg/L)

p-values#

5

1

tet(M), tet(O) and tet(L) or tet(M) and tet(L)

64

64 - 256

0.01 (group 1 vs. 2)

     

<0.001 (group 1 vs. 3)

     

0.002 (group 1 vs. 4)

     

0.002 (group 2 vs. 3)

     

0.03 (group 2 vs. 4)

     

0.08 (group 3 vs. 4)

8

2

tet(M) and tet(O)

32

24 - 48

 

116

3

tet(M)

24

3 - 48

 

22

4

tet(O)

24

16 - 32

 
  1. * MIC50 is the MIC value inhibiting growth of 50% of tested isolates
  2. #Pair-wise comparisons based on Wilcoxon rank-sum tests with Holm correction for multiple testing